Nancy Gann Lackey, Oklahoma

I am looking for information on my paternal great grandmother, Harriet Eliza Gann. She had a sister Nancy Gann Lackey who lived in OKLA> She was one of 8 children born to Julian C. Leonard Gann and Mary Elizabeth Jane Thompkins in Ga in 1869-71. She had one brother Walter D. and six sisters including Nancy and Loulah Gann Tillery. Both sisters lived in Okla, she in Talladaga Co., Ala and Hill Co., Texas. We think she was part Native. She was Please contact, Janelle Chandler Bates